Why the 36.53 degree offset to get temperature?

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Thanks for the info. I can't understand why the constant value of 36.53 is added to convert degrees C in the code that everyone uses. The data sheet says the offset is -521 and since the sensitivity is 340 per degree c, surely 521/340 = 1.53 ?? Yes, I do see the 35 degrees under Conditions - but this was the test condition that the spec was determined under - right? Why is it (apparently) added to the 1,53 to get the 36.53 ? Thanks Russell